Gas Combustion Device

ABSTRACT

A gas combustion device includes a casing and a combustor accommodated in the casing and including a primary combustion section and a secondary combustion section. The gas combustion device further includes an ejector, an air-blowing device accommodated in the casing. A supply of combustion gas and a supply of air are gathered in the ejector, and the ejector includes a mixing chamber that combustion gas and air is mixed and a wick that the mixture of combustion gas and air is injected into the primary combustion. The air-blowing device includes a fan and a sheath. Further, a heat-resisting protector in which the combustor is accommodated includes a front end including a flame taming portion and at least one vent defined thereon and extending through the wall and allows hot air to flow therethrough.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a gas combustion device that has an enhanced stableness when in operation and alleviates waste of energy.

2. Description of the Related Art

Referring to CA Patent 2502563, a gas combustion portable dryer includes a gas tank that stores fuel gas, a combustor that burns fuel gas supplied from the gas tank, an air blower that blows air which has been heated by the combustor to flow so as to be discharged from an outlet of the dryer, a power source that drives a motor for the air blower and cause a lighter to ignite the fuel gas, and an ejector disposed in the combustor to suck primary air by means of a negative pressure produced by the flow rate of fuel gas. Fuel gas is mixed with primary air and the mixture is ejected from a wick and is caused to produce a flame in a primary combustion chamber by the lighter. Additionally, the combustor defines a secondary combustion chamber. Secondary air is fed to react with unburned fuel gas in the secondary combustion chamber after the combustion in the primary combustion chamber, thereby a complete combustion is taken in the secondary chamber. Additionally, secondary air has an effect of lowering the temperature of the primary combustion chamber and is heated before being introduced to the secondary combustion chamber to promote combustion reactions.

In this gas combustion portable dryer, the air blower is positioned at a rear end thereof and is distal to the combustor. Although it is convenient for the air blower to draw atmosphere into the dryer in an effective manner, it is too far for the air blower to effectively deliver air stream to the combustor. So to overcome this, the air blower should be bigger and more powerful. But such air blower would consume a substantial amount of energy and space. Additionally, if the air blower is not powerful enough to blow air to the combustor air is liable to diffuse inside the interior of the gas combustion portable dryer and/or flow out of the dryer to the atmosphere. Even worse, if air is not delivered to pass the outer periphery of the combustor, heat exchange effectiveness can be affected and hot temperature of the combustor will transmit to casing of the potable dryer and cause damage to the casing and user is at risk to get burned.

The present invention is, therefore, intended to obviate or at least alleviate the problems encountered in the prior art.

SUMMARY OF THE INVENTION

According to the present invention, a gas combustion device includes a casing and a combustor accommodated in the casing and including a primary combustion section and a secondary combustion section. The gas combustion device further includes an ejector, an air-blowing device accommodated in the casing. A supply of combustion gas and a supply of air are gathered in the ejector, and the ejector includes a mixing chamber that combustion gas and air is mixed and a wick that the mixture of combustion gas and air is injected into the primary combustion. The air-blowing device includes a fan and a sheath that encases the fan. Further, a heat-resisting protector in which the combustor is accommodated includes a front end including a flame taming portion and at least one vent defined thereon and extending through the wall and allows hot air to flow therethrough.

The secondary combustion section in which combustion gas not get burned in the primary combustion section is combusted in order to avoid incomplete combustion and prevent unburned combustion gas from flowing out of the gas combustion device; and

The heat-resisting protector prevents heat emitted from the combustor to burn and damage the casing; and

The sheath prevents air that the fan blows from being diffused inside the casing and improves the combustion efficiency.

It is an object of the present invention to overcome the problems of the prior art.

It is another object to prevent air that the fan blows from being diffused inside the casing.

It is yet another object to enable a utilization of a smaller fan.

It is a further object to include the heat-resisting protector and heat-insulating member to prevent heat emitted from the combustor from burning and damaging the casing, even if the fan is of a small size.

Other objects, advantages, and new features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanied drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a gas combustion device in accordance with the present invention.

FIG. 2 is an exploded perspective view of the gas combustion device.

FIG. 3 is another exploded perspective view of the gas combustion device.

FIG. 4 is yet another exploded perspective view taken from a different angle than that of FIG. 3.

FIG. 5 is a cross-sectional view of the gas combustion device.

FIG. 6 is a cross sectional view showing the combustion of the gas.

FIG. 7 is a perspective view of a heat-resisting protector in accordance with a second embodiment of the present invention.

FIG. 8 is a perspective view of a heat-resisting protector in accordance with a third embodiment of the present invention.

FIG. 9 is an exploded view of the heat-resisting protector of FIG. 8.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to the drawings, a gas combustion device in accordance with the present invention includes a casing 10 and a combustor 20, an ejector 30, and an air-blowing device 40 are accommodated in the casing 10. The casing 10 is made up of two halves joined together and which shapes are complementary to each other. Furthermore, the casing 10 forms a first casing section 101 in which the combustor 20, ejector 30, air-blowing device 40 and an electricity supply 11 are disposed, and a second casing section 102 in which a gas tank 12 and a control mechanism 13 are disposed. The second casing section 102 is connected to and extending from the first casing section 101 and is adapted for user to grip during the operation of the gas combustion device. The casing 10 also includes an outlet opening at a front end thereof for hot air to flow thereout during the use of the gas combustion device. Hot air is generated by the combustor 20. The outlet opening is defined at a front end of the first casing section 101 and corresponds to and in juxtaposed to the combustor 20.

The electricity supply 11 is utilized to drive the air-blowing device 40. The gas tank 12 is utilized to store combustion gas and a conduit 121 is connected between the gas tank 12 and ejector 30 such that combustion gas is adapted to be delivered to the ejector 30 through a conduit 121 during use of the gas combustion device. Specifically, the conduit 121 has one end connected to the gas tank 12 and another end connected to a connecting end 34 of the ejector 30. Additionally, the connecting end 34 has a filter disposed therein such that combustion gas from the gas tank 12 is filtrated. The control mechanism 13 includes a first 131 and a second 132 controller cooperated together to control the flow-rate of combustion gas discharged from the gas tank 12. In the embodiment, the first controller 131 includes a plurality of teeth defined on a circumferential edge thereof and the second controller 132 includes a plurality of teeth engagable with the teeth of first controller 131. Moreover, the first controller 131 is partially exposed outside the casing 10 for user to operate it. The control mechanism 13 further includes a piezoelectric member 133 used to generate high voltage electricity and connected to the combustor 20 through a wiring 1331 and to an ignition plug 24 through a wiring 1332, respectively. The piezoelectric member 133 is operably controlled by a switch 134. The switch 134 is disposed outside the casing 10. The ignition plug 24 is utilized to ignite a mixture of combustion gas and air in a primary combustion section 21 of the combustor 20. The mixture is ejected from the ejector 30. Specifically, the ejector 30 includes a mixing chamber 31 that combustion gas delivered from the gas tank 12 and air blown by the air-blowing device 40 is mixed, and air is delivered to the mixing chamber 31 due to negative pressure effect, and the mixed gas is delivered to a wick 32 disposed in the primary combustion section 21 of combustor 20 and is injected into the primary combustion section 21 at sonic speed, and the mixed gas is ignited by the ignition plug 24 to generate flame, and flame is caused to expand radially outwardly from lateral sides of the wick 32. Preferably, flame expands in a circular shape.

In the ejector 30, the mixing chamber 31 further includes a cap 311 insertably mounted thereon. The cap 311 includes a plurality of ports 3111 that enable the air-blowing device 40 to blow air into the mixing chamber 31 due to negative pressure effect. Moreover, the mixing chamber 31 includes an outer peripheral edge made of metal mesh. Likewise, the wick 32 includes an outer peripheral edge made of metal mesh.

In the combustor 20, the primary combustion section 21 includes a periphery including a plurality of ridges 211 and a plurality of channels 212 formed thereon and one channel 212 is intervened between two adjacent ridges 211. Moreover, each ridge 211 and channel 212 extends along a longitudinal direction of the primary combustion section 21. Additionally, each ridge 211 includes a passage 2111 extending therethrough and in a longitudinal direction of the ridge 21. The passages 2111 allow the air-blowing device 40 to blow air therethrough so that air cools the temperature of primary combustion section 21. The primary combustion section 21 also includes a plurality of orifice 2121 extending through a rear end of the combustor 20 and such orifices 2121 enable air-blowing device 40 to blow air into the primary combustion section 21, and an engaging hole 25 that the ejector 30 is engaged so as to retain its engagement with the combustor 20. Specifically, the ejector 30 includes an engaging section 33 engaged in the engaging hole 25. The engaging section 33 is formed between the mixing chamber 31 and wick 32.

In addition, the combustor 20 includes a secondary combustion section 22 defined therein and in which combustion gas not get burned in the primary combustion section 21 of combustor 20 is combusted in order to avoid incomplete combustion and prevent unburned combustion gas from flowing out of the combustor 20 and the gas combustion device, and in the secondary combustion section 22 unburned combustion gas would react with air delivered from the passages 2111, and since air is heated by the combustion in the primary combustion section 21 unburned combustion gas is easily reacted, thereby improving the combustion efficiency. Moreover, the combustor 20 includes an outer peripheral wall including a plurality of fins 23 protruding radially outward therefrom. The fins 23 dissipate heat emitted from combustor 20 effectively.

The gas combustion device further includes a heat-resisting protector 50 and a heat-insulating member 60 disposed in the first casing section 101 of casing 10 and encasing the combustor 20 in order to protect heat emitted from the combustor 20 from burning the casing 10, or even worse, damaging the wall of the casing 10.

The heat-resisting protector 50 is made of metal, preferably such metal has the advantage of good heat-resisting ability and is not liable to be damaged under heat, and is hollow such that it defines a compartment 51 in which the combustor 20 is accommodated and the outer peripheral wall of the combustor 20 and fins 23 protruding from the outer peripheral wall are surrounded by an wall of the compartment 51. Moreover, the heat-resisting protector 50 includes a front end including a wall that includes a flame taming portion 52 and at least one vent 53 defined thereon. The flame taming portion 52 is defined by the wall and prevents flame in the combustor 20 from spreading out of the heat-resisting protector 50. The at least one vent 53 extends through the wall and allows hot air to flow therethrough. In the embodiment, the heat-resisting protector 50 includes a plurality of vents 53, for example, four vents 53. Preferably, the vents 53 are spaced radially from a center of flame taming portion 52. Preferably, each vent 53 is of a crescent shape. The heat-resisting protector 50 further includes a stepped outer peripheral wall such that it includes a flange 54 defined thereon and formed between a portion of the outer peripheral wall that has a larger diametrical size and a portion of the outer peripheral wall that has a smaller diametrical size. In addition, the heat-resisting protector 50 includes a flame-taming member 70 disposed in the compartment 51 and positioned behind its front end and in front of the combustor 20 such that flame exited from the combustor 20 is tamed. Preferably, the flame-taming member 70 is a meshed net. Preferably, the flame-taming member 70 is made of metal.

The heat-insulating member 60 is mounted on the outer peripheral wall of the heat-resisting protector 50 and prevents the heat-resisting protector 50 to transmit heat to the casing 10. Preferably, the heat-insulating member 60 is made of ceramic fiber. In addition, the heat-insulating member 60 is restricted in the casing 10 and is kept mounted on the heat-resisting protector 50 by a holder 80. The holder 80 includes an inner peripheral wall that contacts with the heat-insulating member 60 and an outer peripheral wall that engages with an inner peripheral wall of the first casing section 101 of casing 10.

In addition, a hollow outlet pipe 90 is adapted to be mounted at the outlet opening of the gas combustion device to enable it to give a concentrated path of hot air during the use thereof. In the embodiment, the outlet pipe 90 is mounted on the outer peripheral wall of heat-resisting protector 50 and includes an end defining a joining section 901 that connects the outlet pipe 90 to the heat-resisting protector 50 and another end defining an exit 902, and the joining section 901 is insertably mounted to the outer peripheral wall of heat-resisting protector 50 until it is stopped by the flange 54 defined thereon.

Furthermore, the air-blowing device 40 includes a fan 41 and a sheath 42 that encases air that the fan 41 blows, thereby preventing air from being diffused inside the casing 10 and that results a substantial loss of air flowing into the compartment 51 of heat-resisting protector 50, and the combustor 20 and ejector 30. In this regard, the size of the fan 41 is adapted to be reduced. Preferably, the sheath 42 encases the fan 41 such that the tips of fan blades of the fan 41 are disposed inside an inner periphery of the sheath 42. In addition, the sheath 42 extends longitudinally from a first position adjacent to the fan 41 to a second position marginally gapped from the heat-resisting protector 50 at a distance “D” Moreover, the sheath 42 has a gradually reduced inner diameter as it extends towards the heat-resisting protector 50, and therefore accelerating air and improving the supplying speed of air. Preferably, the sheath 42 has a rear end with a larger inner diameter and a front end with a smaller inner diameter. Preferably, the heat-resisting protector 50 has a rear end defining an opening that has an inner diameter equaling to that of the front end of sheath 42, therefore enabling air in the sheath 42 to flow smoothly into the compartment 51 of heat-resisting protector 50. While air is accelerated, a problem that backflow air would occur and impede delivering of air to the compartment 51 of heat-resisting protector 50, and the combustor 20 and ejector 30, but it is resolved as the sheath 42 is marginally gapped by the rear end of heat-resisting protector 50 with the distance “D” that is enough to allow backflow air to escape therefrom, and therefore alleviating the problem. Additionally, the sheath 42 includes cutouts 421 and slots defined therein. The cutouts 421 allow wirings 1331 to pass through.

FIG. 7 shows a heat-resisting protector 50 a in accordance with a second embodiment of the present invention. The heat-resisting protector 50 a differentiates from the heat-resisting protector 50 in that it includes a plurality of vents 53 a. Each vent 53 a is of a circular shape. The plurality of vents 53 a are disposed around a flame taming portion 52 a of the heat-resisting protector 50 a and are arranged as a plurality of arrays, for example, three arrays and a first array includes vents 53 a that are spaced radially and equally from the flame taming portion 52 a at a first distance, a second array includes vents 53 a that are spaced radially and equally from the flame taming portion 52 a at a second distance and a third array includes vents 53 a that are spaced radially and equally from the flame taming portion 52 a at a third distance, and with the first, second and third distances being unequal to one another.

FIGS. 8 and 9 show a heat-resisting protector 50 b in accordance with a third embodiment of the present invention. The heat-resisting protector 50 b differentiates from the heat-resisting protector 50 in that it includes a flame taming portion 52 b and a plurality of vents 53 b defined on a member that is separately formed with a body of the heat-resisting protector 50 b.

In view of forgoing, it is an object of the present invention to overcome the problems of the prior art. It is another object to prevent air that the fan 41 blows from being diffused inside the casing 10. It is yet another object to enable a utilization of a smaller fan 41. It is a further object to include the heat-resisting protector 50, 50 a and 50 b and heat-insulating member 60 to prevent heat emitted from the combustor 20 from burning and damaging the casing 10, even if the fan 41 is of a small size.

While the specific embodiments have been illustrated and described, numerous modifications come to mind without significantly departing from the spirit of invention, and the scope of invention is only limited by the scope of the accompanying claims. 

1. A gas combustion device comprising: a casing; a combustor accommodated in the casing and including a primary combustion section and a secondary combustion section; an ejector accommodated in the casing and in which a supply of combustion gas and a supply of air are gathered, the ejector including a mixing chamber that combustion gas and air is mixed and a wick that the mixture of combustion gas and air is injected into the primary combustion section; an air-blowing device accommodated in the casing and including a fan and a sheath; a heat-resisting protector in which the combustor is accommodated and including a front end including a flame taming portion and at least one vent defined thereon, the at least one vent extends through the wall and allows hot air to flow therethrough; and wherein the mixture of combustion gas and air is combusted in the combustor to generate hot air, and the secondary combustion section combusts combustion gas not get burned in the primary combustion section in order to avoid incomplete combustion and prevent unburned combustion gas from flowing out of the gas combustion device; and wherein the heat-resisting protector prevents heat emitted from the combustor to burn and damage the casing; and wherein the sheath prevents air that the fan blows from being diffused inside the casing and improves the combustion efficiency.
 2. The gas combustion device as claimed in claim 1, wherein the sheath extends from a first position adjacent to the fan to a second position marginally gapped from the heat-resisting protector, wherein the sheath has a gradually reduced inner diameter that renders air that the fan blows be accelerated, and wherein the sheath is gapped from the heat-resisting protector at a distance “D” that is enough to allow backflow air to escape therefrom and stop it impeding the fan to deliver air.
 3. The gas combustion device as claimed in claim 2, wherein the sheath has a rear end with a larger inner diameter and a front end with a smaller inner diameter, wherein the heat-resisting protector has a rear end defining an opening that has an inner diameter equaling to that of the front end of sheath, therefore enabling air in the sheath to flow smoothly into the heat-resisting protector.
 4. The gas combustion device as claimed in claim 1 further comprising a heat-insulating member mounted on an outer peripheral wall of the heat-resisting protector.
 5. The gas combustion device as claimed in claim 2 further comprising a heat-insulating member mounted on an outer peripheral wall of the heat-resisting protector.
 6. The gas combustion device as claimed in claim 3 further comprising a heat-insulating member mounted on an outer peripheral wall of the heat-resisting protector.
 7. The gas combustion device as claimed in claim 4, wherein the heat-insulating member is restricted in the casing and is kept mounted on the heat-resisting protector by a holder.
 8. The gas combustion device as claimed in claim 5, wherein the heat-insulating member is restricted in the casing and is kept mounted on the heat-resisting protector by a holder.
 9. The gas combustion device as claimed in claim 6, wherein the heat-insulating member is restricted in the casing and is kept mounted on the heat-resisting protector by a holder.
 10. The gas combustion device as claimed in claim 1 further comprising a flame-taming member disposed in the heat-resisting protector and positioned in front of the combustor.
 11. The gas combustion device as claimed in claim 1 further comprising an outlet pipe mounted at an outlet opening of hot air such that the outlet pipe renders a concentrated path of hot air.
 12. The gas combustion device as claimed in claim 1, wherein the primary combustion section includes a periphery including a plurality of ridges and a plurality of channels formed thereon and one channel is intervened between two adjacent ridges, wherein each ridge includes a passage extending therethrough to such that the passage enables the air-blowing device to blow air therethrough to cool the temperature of primary combustion section, wherein the primary combustion section also includes a plurality of orifice extending through a rear end of the combustor and such orifices enable air-blowing device to blow air into the primary combustion section, and wherein the combustor includes an outer peripheral wall including a plurality of fins protruding radially outward therefrom such that the fins enable heat generated from combustor to be dissipated effectively.
 13. The gas combustion device as claimed in claim 2, wherein the primary combustion section includes a periphery including a plurality of ridges and a plurality of channels formed thereon and one channel is intervened between two adjacent ridges, wherein each ridge includes a passage extending therethrough to such that the passage enables the air-blowing device to blow air therethrough to cool the temperature of primary combustion section, wherein the primary combustion section also includes a plurality of orifice extending through a rear end of the combustor and such orifices enable air-blowing device to blow air into the primary combustion section, and wherein the combustor includes an outer peripheral wall including a plurality of fins protruding radially outward therefrom such that the fins enable heat generated from combustor to be dissipated effectively.
 14. The gas combustion device as claimed in claim 3, wherein the primary combustion section includes a periphery including a plurality of ridges and a plurality of channels formed thereon and one channel is intervened between two adjacent ridges, wherein each ridge includes a passage extending therethrough to such that the passage enables the air-blowing device to blow air therethrough to cool the temperature of primary combustion section, wherein the primary combustion section also includes a plurality of orifice extending through a rear end of the combustor and such orifices enable air-blowing device to blow air into the primary combustion section, and wherein the combustor includes an outer peripheral wall including a plurality of fins protruding radially outward therefrom such that the fins enable heat generated from combustor to be dissipated effectively.
 15. The gas combustion device as claimed in claim 4, wherein the primary combustion section includes a periphery including a plurality of ridges and a plurality of channels formed thereon and one channel is intervened between two adjacent ridges, wherein each ridge includes a passage extending therethrough to such that the passage enables the air-blowing device to blow air therethrough to cool the temperature of primary combustion section, wherein the primary combustion section also includes a plurality of orifice extending through a rear end of the combustor and such orifices enable air-blowing device to blow air into the primary combustion section, and wherein the combustor includes an outer peripheral wall including a plurality of fins protruding radially outward therefrom such that the fins enable heat generated from combustor to be dissipated effectively.
 16. The gas combustion device as claimed in claim 1, wherein the at least one vent includes a plurality of vents disposed around the flame taming portion and are arranged as a plurality of arrays, wherein one array includes vents that are spaced radially and equally from the flame taming portion at a first distance, and wherein another array includes vents that are spaced radially and equally from the flame taming portion at a second distance, and with the first and second distances being unequal to one another.
 17. The gas combustion device as claimed in claim 1, wherein the heat-resisting protector includes the flame taming portion and plurality of vents defined on a member that is separately formed with a body of the heat-resisting protector.
 18. The gas combustion device as claimed in claim 1, wherein the sheath encases the fan such that the tips of fan blades of the fan are disposed inside an inner periphery of the sheath.
 19. The gas combustion device as claimed in claim 1, further including a cap including a plurality of ports that enable the air-blowing device to blow air into the mixing chamber due to negative pressure effect. 